linux-kernel - Re: [LTP] [PATCH] sched/core: Use empty mask to reset cpumasks in sched

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Message-ID: <bd976e78-953c-68cb-291f-7ad2188aa3fb@redhat.com>
Date:   Thu, 20 Jul 2023 22:13:48 -0400
From:   Waiman Long <longman@...hat.com>
To:     Cyril Hrubis <chrubis@...e.cz>,
        kernel test robot <oliver.sang@...el.com>
Cc:     Juri Lelli <juri.lelli@...hat.com>,
        Brent Rowsell <browsell@...hat.com>,
        Valentin Schneider <vschneid@...hat.com>,
        Phil Auld <pauld@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        yu.c.chen@...el.com, Peter Zijlstra <peterz@...radead.org>,
        aubrey.li@...ux.intel.com, linux-kernel@...r.kernel.org,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>,
        Peter Hunt <pehunt@...hat.com>, Ingo Molnar <mingo@...hat.com>,
        Mel Gorman <mgorman@...e.de>, oe-lkp@...ts.linux.dev,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        ltp@...ts.linux.it, lkp@...el.com
Subject: Re: [LTP] [PATCH] sched/core: Use empty mask to reset cpumasks in
 sched_setaffinity()

On 7/17/23 10:41, Cyril Hrubis wrote:
> Hi!
>> Running tests.......
>> <<<test_start>>>
>> tag=sched_setaffinity01 stime=1689382567
>> cmdline="sched_setaffinity01"
>> contacts=""
>> analysis=exit
>> <<<test_output>>>
>> tst_test.c:1558: TINFO: Timeout per run is 0h 02m 30s
>> sched_setaffinity01.c:83: TPASS: sched_setaffinity() failed: EFAULT (14)
>> sched_setaffinity01.c:73: TFAIL: sched_setaffinity() succeded unexpectedly
>> tst_test.c:1612: TINFO: If you are running on slow machine, try exporting LTP_TIMEOUT_MUL > 1
>> tst_test.c:1614: TBROK: Test killed! (timeout?)
> So what the test does is that it sets empty affinity mask to
> sched_setaffinity() and expects EINVAL. Instead it looks like the call
> now succeeeds, the test stops getting schedulled and is killed by
> timeout.
>
I had sent out a v2 patch should not fail the LTP's sched_setaffinity() 
test.

Cheers,
Longman